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DEFERRED COMPENSATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
DEFERRED COMPENSATION |  |  |  |  |
Deferred compensation liability | $ 0 |  | $ 0 |  |
Deferred compensation expense |  |  | $ 1,660 | $ 3,565 |
SERP |  |  |  |  |
DEFERRED COMPENSATION |  |  |  |  |
Deferred compensation liability |  |  |  |  | $ 12,789
Deferred compensation expense | $ 690 | $ 3,440 |  |  |
Period over which SERP benefit payments to be paid |  |  | 30 years |  |

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- Definition Maximum term of the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 + Details
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